If you are looking for a relationship, I suggest you do the usual things to meet a woman, perhaps devlop the relationship further where discussion on sexual lifestyles can then be undertaken.

Most women do not really open up until there is significant trust. Trust is also vital in a D/s relationship.

You may also consider that many women do not know that they are dominant or would even enjoy the dominant sexual role - society has been telling us for centuries to be timid,passive and fragile.

It could be a gradual change - step by step - but beware and be careful what you wish for. Female Dominants can be very cruel mentally. Rather than the stereotype of a whip, mental cruelty and humilation are the weapons of choice of female dominants.
It's just a little more lady-like, somehow.